julian, sorry to be a pain but if i infowm the OR that i have just moved in then how could i have missed any payments? this is all very stressfull, i need a beer!!
if you evidence the start date of your tenancy and have receipts for deposit & rent, produce copies for the OR and pass them to him requesting no contact with the landlord / letting agent.
It's not guaranteed to work but well worth a try and I have seen this strategy work often.
It will depend on your examiner, if he's sensible then you'll be fine.